crypto: hisilicon/zip: fix memory leak in hisi_zip_create_req_q()

[IAMHCHCH]

Problem

In hisi_zip_create_req_q(), when the DECOMP (i=1) request array allocation via kzalloc_objs() fails after the COMP (i=0) allocations already succeeded, the error path jumps to err_free_comp_q.

This label frees the COMP q array (kfree) but does NOT free the COMP req_bitmap, causing a memory leak of one bitmap per failed ctx init.

Root Cause Analysis

i=0 (COMP): bitmap_zalloc OK, kzalloc_objs OK
i=1 (DECOMP): bitmap_zalloc OK, kzalloc_objs FAIL

goto err_free_decomp_bitmap  → frees DECOMP bitmap
goto err_free_comp_q         → frees COMP q array
                                  COMP bitmap is LEAKED ⚠️
goto err_free_comp_bitmap    → never reached

Fix

Add bitmap_free() for COMP req_bitmap in err_free_comp_q label, paired with the existing kfree():

err_free_comp_q:
    kfree(ctx->qp_ctx[HZIP_QPC_COMP].req_q.q);
    bitmap_free(ctx->qp_ctx[HZIP_QPC_COMP].req_q.req_bitmap);  // ← added
err_free_comp_bitmap:
    bitmap_free(ctx->qp_ctx[HZIP_QPC_COMP].req_q.req_bitmap);

Scope

• Single file modified: drivers/crypto/hisilicon/zip/zip_crypto.c
• Single line added: +1
• No functional change to the normal (non-error) code path
• Triggers only on allocation failure during ctx init

Testing

Please verify:

1. Confirm the error path analysis is correct
2. If possible, test with injected allocation failure for DECOMP

Reviewed-by: (pending)